adamc@25: (* Copyright (c) 2008, Adam Chlipala
adamc@25:  * All rights reserved.
adamc@25:  *
adamc@25:  * Redistribution and use in source and binary forms, with or without
adamc@25:  * modification, are permitted provided that the following conditions are met:
adamc@25:  *
adamc@25:  * - Redistributions of source code must retain the above copyright notice,
adamc@25:  *   this list of conditions and the following disclaimer.
adamc@25:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@25:  *   this list of conditions and the following disclaimer in the documentation
adamc@25:  *   and/or other materials provided with the distribution.
adamc@25:  * - The names of contributors may not be used to endorse or promote products
adamc@25:  *   derived from this software without specific prior written permission.
adamc@25:  *
adamc@25:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@25:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@25:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@25:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@25:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@25:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@25:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@25:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@25:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@25:  * POSSIBILITY OF SUCH DAMAGE.
adamc@25:  *)
adamc@25: 
adamc@25: structure MonoEnv :> MONO_ENV = struct
adamc@25: 
adamc@25: open Mono
adamc@25: 
adamc@25: structure IM = IntBinaryMap
adamc@25: 
adamc@25: 
adamc@25: exception UnboundRel of int
adamc@25: exception UnboundNamed of int
adamc@25: 
adamc@25: type env = {
adamc@168:      datatypes : (string * (string * int * typ option) list) IM.map,
adamc@178:      constructors : (string * typ option * int) IM.map,
adamc@25: 
adamc@183:      relE : (string * typ * exp option) list,
adamc@109:      namedE : (string * typ * exp option * string) IM.map
adamc@25: }
adamc@25: 
adamc@25: val empty = {
adamc@168:     datatypes = IM.empty,
adamc@178:     constructors = IM.empty,
adamc@25: 
adamc@25:     relE = [],
adamc@25:     namedE = IM.empty
adamc@25: }
adamc@25: 
adamc@168: fun pushDatatype (env : env) x n xncs =
adamc@168:     {datatypes = IM.insert (#datatypes env, n, (x, xncs)),
adamc@182:      constructors = foldl (fn ((x, n', to), constructors) =>
adamc@182:                               IM.insert (constructors, n', (x, to, n)))
adamc@178:                           (#constructors env) xncs,
adamc@25: 
adamc@25:      relE = #relE env,
adamc@25:      namedE = #namedE env}
adamc@25: 
adamc@168: fun lookupDatatype (env : env) n =
adamc@168:     case IM.find (#datatypes env, n) of
adamc@25:         NONE => raise UnboundNamed n
adamc@25:       | SOME x => x
adamc@25: 
adamc@178: fun lookupConstructor (env : env) n =
adamc@178:     case IM.find (#constructors env, n) of
adamc@178:         NONE => raise UnboundNamed n
adamc@178:       | SOME x => x
adamc@178: 
adamc@183: fun pushERel (env : env) x t eo =
adamc@168:     {datatypes = #datatypes env,
adamc@178:      constructors = #constructors env,
adamc@25: 
adamc@183:      relE = (x, t, eo) :: #relE env,
adamc@25:      namedE = #namedE env}
adamc@25: 
adamc@25: fun lookupERel (env : env) n =
adamc@25:     (List.nth (#relE env, n))
adamc@25:     handle Subscript => raise UnboundRel n
adamc@25: 
adamc@109: fun pushENamed (env : env) x n t eo s =
adamc@168:     {datatypes = #datatypes env,
adamc@178:      constructors = #constructors env,
adamc@25: 
adamc@25:      relE = #relE env,
adamc@109:      namedE = IM.insert (#namedE env, n, (x, t, eo, s))}
adamc@25: 
adamc@25: fun lookupENamed (env : env) n =
adamc@25:     case IM.find (#namedE env, n) of
adamc@25:         NONE => raise UnboundNamed n
adamc@25:       | SOME x => x
adamc@25: 
adamc@164: fun declBinds env (d, loc) =
adamc@25:     case d of
adamc@164:         DDatatype (x, n, xncs) =>
adamc@164:         let
adamc@168:             val env = pushDatatype env x n xncs
adamc@196:             val dt = (TDatatype (n, ref (MonoUtil.classifyDatatype xncs, xncs)), loc)
adamc@164:         in
adamc@188:             foldl (fn ((x', n', NONE), env) => pushENamed env x' n' dt NONE ""
adamc@188:                     | ((x', n', SOME t), env) => pushENamed env x' n' (TFun (t, dt), loc) NONE "")
adamc@164:             env xncs
adamc@164:         end
adamc@164:       | DVal (x, n, t, e, s) => pushENamed env x n t (SOME e) s
adamc@126:       | DValRec vis => foldl (fn ((x, n, t, e, s), env) => pushENamed env x n t NONE s) env vis
adamc@109:       | DExport _ => env
adamc@25: 
adamc@179: fun patBinds env (p, loc) =
adamc@179:     case p of
adamc@179:         PWild => env
adamc@183:       | PVar (x, t) => pushERel env x t NONE
adamc@179:       | PPrim _ => env
adamc@188:       | PCon (_, _, NONE) => env
adamc@188:       | PCon (_, _, SOME p) => patBinds env p
adamc@182:       | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
adamc@179: 
adamc@25: end